Delete nasal_lexer.h

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Valk Richard Li 2019-09-26 20:00:44 +08:00 committed by GitHub
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#ifndef __NASAL_LEXER_H__
#define __NASAL_LEXER_H__
#include <iostream>
#include <fstream>
#include <cstring>
#include "nasal_functional.h"
#define FAIL -1 //ʧ°Ü
#define SCANEND -2 //ɨÃèÍê³É
#define ERRORFOUND -3 //Òì³£´íÎó
std::string ReserveWord[26]=
{
"for","foreach","forindex","while",
"var","func","break","continue","return",
"if","else","elsif","nil","and","or",
"print","cmp","append","setsize","subvec","pop",
"sort","contains","delete","keys","typeof"
};
std::string OperatorOrDelimiter[40]=
{
"+","-","*","/","=","+=","-=","*=","/=",
"\n","\t","\r","\\","\'","\"",".",
"<","<=",">",">=","==","!=","~=","!","~",
",",";","(",")","[","]","{","}","#","?",":",
"&","|","%","^"
};
std::string IdentifierTable[1000]={""};
char ResourceProgram[16777216];
int isReserveWord(std::string &p)
{
for(int i=0;i<26;++i)
if(ReserveWord[i]==p)
return i+1;
return FAIL;
}
int isOperatorOrDelimiter(std::string &p)
{
for(int i=0;i<40;++i)
if(OperatorOrDelimiter[i]==p)
return i+1;
return FAIL;
}
bool isLetter(char t)
{
return (('a'<=t) && (t<='z') || ('A'<=t) && (t<='Z'));
}
bool isNumber(char t)
{
return (('0'<=t) && (t<='9'));
}
void InputFile(std::string &FileName)
{
std::ifstream fin(FileName);
int i=0;
bool FindNote=false;
while(!fin.eof())
{
ResourceProgram[i]=fin.get();
if(ResourceProgram[i]=='\n')
FindNote=false;
if(ResourceProgram[i]!='#' && !FindNote)
++i;
else if(ResourceProgram[i]=='#')
{
FindNote=true;
}
if(fin.eof())
break;
}
ResourceProgram[i]=0;
fin.close();
return;
}
void PrintSourceFile()
{
int line=1;
std::cout<<line<<" ";
for(int i=0;i<16777216;++i)
{
if(!ResourceProgram[i])
break;
std::cout<<ResourceProgram[i];
if(ResourceProgram[i]=='\n')
{
++line;
std::cout<<line<<" ";
}
}
std::cout<<std::endl;
}
void Scanner(int &Syn,const char Source[],std::string &token,int &ptr,int &line)
{
char temp;
temp=Source[ptr];
while(temp==' ' || temp=='\n' || temp=='\t' || temp=='\r' || temp<0 || temp>127)
{
++ptr;
if(temp=='\n')
++line;
temp=Source[ptr];
}
token="";
if(isLetter(temp) || temp=='_')
{
token+=temp;
++ptr;
temp=Source[ptr];
while(isLetter(temp) || isNumber(temp) || temp=='_')
{
token+=temp;
++ptr;
temp=Source[ptr];
}
Syn=isReserveWord(token);
if(Syn==FAIL)
Syn=IDENTIFIER;
else
Syn=RESERVEWORD;
}
else if(isNumber(temp))
{
int PointCnt=0;
while(isNumber(temp))
{
token+=temp;
++ptr;
temp=Source[ptr];
if(temp=='.' && !PointCnt)
{
++PointCnt;
token+=temp;
++ptr;
temp=Source[ptr];
}
}
Syn=NUMBER;
}
else if(temp=='(' || temp==')' || temp=='[' || temp==']' || temp=='{' ||
temp=='}' || temp==',' || temp==';' || temp=='|' || temp==':' ||
temp=='?' || temp=='.' || temp=='`' || temp=='\'' || temp=='&'||
temp=='%' || temp=='$' || temp=='^')
{
token+=temp;
++ptr;
Syn=OPERATOR;
}
else if(temp=='=' || temp=='+' || temp=='-' || temp=='*' || temp=='!' || temp=='/' || temp=='<' || temp=='>' || temp=='~')
{
Syn=OPERATOR;
token+=temp;
++ptr;
temp=Source[ptr];
if(temp=='=')
{
token+=temp;
++ptr;
}
}
else if(temp=='\\')
{
Syn=OPERATOR;
token+=temp;
++ptr;
temp=Source[ptr];
if(temp=='=' || temp=='n' || temp=='t' || temp=='r' || temp=='\\' || temp=='\'' || temp=='\"')
{
token+=temp;
++ptr;
}
}
else if(temp=='\"')
{
Syn=STRING;
token+=temp;
++ptr;
temp=Source[ptr];
while(temp!='\"')
{
if(temp=='\\')
{
token+=temp;
++ptr;
temp=Source[ptr];
token+=temp;
++ptr;
temp=Source[ptr];
}
else
{
token+=temp;
++ptr;
temp=Source[ptr];
}
if(temp==0 || temp=='\n')
break;
}
//add the last char \"
if(temp=='\"')
{
token+=temp;
++ptr;
}
else
token+=" __missing_end_of_string";
}
else if(temp==0)
{
Syn=SCANEND;
return;
}
else
{
Syn=FAIL;
std::cout<<"[Error] Unexpected error occurred: "<<temp<<std::endl;
system("pause");
++ptr;
return;
}
if(token=="")
{
Syn=ERRORFOUND;
std::cout<<"[Error] Cannot identify "<<std::endl;
}
return;
}
token_list nasal_lexer;
void RunProcess(std::string &FileName)
{
int Syn=0;//token type
int Ptr=0;//pointer to one char in ResourcePrograme
int line=1;
std::string token;
std::ifstream fin(FileName);
if(fin.fail())
{
std::cout<<"[Error] Failed to load file: "<<FileName<<std::endl;
fin.close();
return;
}
else
fin.close();
ResourceProgram[0]=0;
nasal_lexer.delete_all();
InputFile(FileName);
while(Syn!=SCANEND && Syn!=ERRORFOUND)
{
Scanner(Syn,ResourceProgram,token,Ptr,line);
if(Syn>0)//all Syn type is larger than zero
nasal_lexer.append(line,Syn,token);
}
//nasal_lexer.print(); //for debug mode
std::cout<<">> Complete scanning \""<<FileName<<"\"."<<std::endl;
return;
}
#endif